The Hidrogen drum program is built for Linux and is free to use. The interface is easy to use and multifunctional. You can make several rythmes by marking a sound on the rythem lines at a specific time in the loop. After that, the rythem is placed in the song in a specific place. There are many sounds preinstalled in Hidrogen and the volume of the sound used in a rythem part is adjustable. The project is saved in a ".h2song" format and a rythem with an ".h2pattern" extension which are not usable anywhere else, but do not take up a lot of space. When the song is ready, you can save it as a MIDI, WAV, AIFF, OGG or FLAC. It has a lot of effects and sound modulation software embedded. The song and the rythem number do not have limitations. The Hidrogen rythem software is free, functional, complex and easy to use.